1. Mathematical Modeling for Preservice Teachers: A Problem from Anesthesiology

   • Thomas Lingefjärd

   OriginalPaper Pages: 117 - 143

2. Theorem Justification and Acquisition in Dynamic Geometry: A Case of Proof by Contradiction

   • Allen Leung
   • Francis Lopez-Real

   OriginalPaper Pages: 145 - 165

3. Understanding Qualitative Calculus: A Structural Synthesis of Learning Research

   • Walter M. Stroup

   OriginalPaper Pages: 167 - 215

4. North Pole Adventures

   • Pavel Boytchev

   OriginalPaper Pages: 217 - 242